Explore a comprehensive design space for intelligent and interactive writing assistants in this 15-minute conference talk from CHI 2024. Delve into the multidimensional aspects of writing assistants, including task, user, technology, interaction, and ecosystem. Learn how researchers systematically reviewed 115 papers to define dimensions and codes within each aspect, leveraging expertise from various disciplines. Gain insights into navigating, comprehending, and comparing the possibilities of writing assistants, and discover practical tools for designing new writing technologies. Understand how this structured approach addresses the fragmentation of research across different communities and offers a unified framework for advancing the field of intelligent writing assistance.